an interval may be followed by a timezone specification string (this is not supported yet).

duration has the form (regular expression):

P(<number><nameOfDuration>)+

nameOfDuration may be one of:

y(year), m(month), w(week), d(day), h(hour), M(minute), S(second)

date follows ISO8601 and must include hypens. (any amount of trailing
elements may be omitted and will be filled in differently on the
differents ends of the interval as to include the longest possible
interval):

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